High-analysis nitrogen-phosphorus compounds
and methods for their preparation

ABSTRACT

NEW COMPOSITIONS OF MATTER HAVE BEEN PREPARED BY REACTION OF UREA WITH THE HYDROLYSIS PRODUCTS OF PHOSPHORIC OXIDE, AMONG THE NEW SALTS ARE THE CRYSTALLINE ADDUCTS OF UREA WITH TETRAMETAPHOSPHORIC ACID AND LONGCHAIN POLYPHOSPHORIC ACID. ADDUCTS OF UREA WITH POLYPHOSPHORIC ACIDS WITH SHORT AND INTERMEDIATE CHAIN LENGTHS ARE AMORPHOUS. WHEN THE UREA TETRAMETAPHOSPHORIC ACID ADDUCT IS DISSOLVED IN AN AQUEOUS AMMONIUM HYDROXIDE SOLUTION, A PRODUCT OF AMMONIUM TETRAMETAPHOSTATE AND UREA CAN BE RECOVERED BY EVAPORTION OF THE AQUEOUS PHASE OR BY ADDITION OF ALCOHOL. A NEW POLYMORPHIC MIDIFICATION OF AMMONIUM TETRAMETAPHOSPHATE, HAS BEEN PREPARED IN THIS WAY. IN ADDITION, A NEW POLYMORPH OF LONG-CHAIN AMMONIUM POLYPHOSPHATE HAS BEEN PREPARED BY PYROLYSIS OF THE UREA TETRAMETAPHOSPHORIC ACID ADDUCT.

DEFENSIVE PULIGATION UNITED STATES PATENT AND TRADEMARK OFFICE Published at the request of the applicant or owner in accordance with the Notice of Dec. 16, 1969, 869 O.G. 687. The abstracts of Defensive Publication applications are identified by distinctly numbered series and are.arrnnged chronologically. Theheading of each abstract indicates the number of pages of specification, including claims and sheets of drawings contained in the application as originally filed. The files oi those applications are available to the public for inspection and reproduction may be purchased for 30 cents a sheet.

Defensive Publication applieationshave not been examined as to the merits of alleged invention. The Patent and Trademark Oliice makes no assertion as to the novelty of the disclosed subject matter.

PUBLISHED SEPTEMBER 2, 197 5 T938,00l HIGH-ANALYSITS Ni'lROGEN-PHOSPHORUS COM- PGUNDS AND METHDDS FOR THEIR PREPARA- Tl'ON Kjell R. Waerstad, Colbert Height, 35674, and Guerry H. McClellan, Box 212, Rte. 1 35645, both of Killen,

Ala.

Filed May 14, 15373, Scr. No. 360,102 Int. Cl. (305i) 15/00 US. Cl. 7l--2 1 Sheet Drawing. 23 Pages Specification PQOIO 4 UREA Q ,3

g COOLING New compositions of matter have been prepared by reaction of urea with the hydrolysis products of phosphoric oxide. Among the new salts are the crystalline adducts of urea with tetrametaphosphoric acid and longchain polyphosphoric acid. Adducts of urea with polyphosphoric acids with short and intermediate chain lengths are amorphous. When the urea tetramctaphosphoric acid adduct is dissolved in an aqueous ammonium hydroxide solution, a product of ammonium tetramctaphosphate and urea can be recovered by evaporation of the aqueous phase or by addition of alcohol. A new polymorphic modification of ammonium tetrametaphosphate has been prepared in this Way. In addition, a new polymorph of long-chain ammonium polyphosphate has been prepared by pyrolysis of the urea tctrametaphosphoric acid adduct.

Sept. 2, 1975 UREA K. R. WAERSTAD ET AL HIGH--ANALYSIS NITROGEN-PHOSPHORUS COMPOUNDS AND METHODS FOR THEIR PREPARATION Filed May 14, 1975 COOLING REACTOR I37 ORGANK;

16 Q l SOLVENT v 7 FILTER CAKE 6 EXTRACTOR a ;/4 l0 ALTERNATE NO.I .2 /5 /7 BYPRODUCT )9 l6 CRYSTALLINE LIQUID FILTER PRODUCT FERTILIZER 49 RECOVERY OF ORGANIC SOLVENT 

